1. K. Nagai, S. Iwasaki, T. Moriya, Manufacturing conditions for particulate alloy tape media and the properties, 1960 Joint Convention Record of Four Institutes of Electrical Engineers, Japan, April 1960, p. 449 (in Japanese)
2. S. Iwasaki, K. Takemura, An investigation into the circular mode of magnetization in short wavelength recording, National Convention Record, IECE Japan, Vol. S17-1, 1974, p. 63 (in Japanese)
3. An analysis for the circular mode of magnetization in short wavelength recording